style.css

* {
  box-sizing: border-box;
}
body {
  background-color: #eee;
  font-family: "Lato", Helvetica, Arial;
  font-size: 15px;
  display: flex;
  margin: 0;
  min-height: 100vh;
}
.models {
  display: none;
}

header {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  height: 60px;
  background-color: #399ade;
  display: none;
  justify-content: flex-end;
  align-items: center;
}
.menu-openner {
  margin-right: 15px;
  font-size: 26px;
  background-color: #a9dcff;
  padding: 5px 20px;
  border-radius: 5px;
  cursor: pointer;
}
.menu-openner span {
  margin-right: 10px;
}
.menu-closer {
  width: 32px;
  height: 32px;
  display: none;
  font-size: 30px;
  cursor: pointer;
  color: red;
}

aside {
  background-color: #9ccbe6;
  width: 0vw;
  font-family: "Hepta Slab", Helvetica, Arial;
  transition: all ease 0.2s;
  overflow-x: hidden;
  z-index: 3;
}
aside.show {
  width: 30vw;
}
.cart--area {
  padding: 20px;
}
main {
  flex: 1;
  padding: 20px;
}
h1 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: "Hepta Slab", Helvetica, Arial;
}
.pizza-area {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
.pizza-item {
  text-align: center;
  max-width: 250px;
  font-family: "Hepta Slab", Helvetica, Arial;
  margin: 0 auto 50px auto;
}
.pizza-item a {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
}
.pizza-item--img {
  width: 200px;
  height: 200px;
  background-color: #eee;
  border-radius: 100px;
  box-shadow: 0px 10px 50px rgba(0, 0, 0, 0.2);
}
.pizza-item--img img {
  width: 100%;
  height: auto;
}
.pizza-item--add {
  z-index: 2;
  width: 50px;
  height: 50px;
  line-height: 50px;
  border-radius: 25px;
  background-color: #388bc5;
  text-align: center;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  margin-top: -25px;
  transition: all ease 0.2s;
}
.pizza-item a:hover .pizza-item--add {
  background-color: #244c88;
}
.pizza-item--price {
  font-size: 15px;
  color: #333;
  margin-top: 5px;
}
.pizza-item--name {
  font-size: 20px;
  font-weight: bold;
  color: #000;
  margin-top: 5px;
}
.pizza-item--desc {
  font-size: 13px;
  color: #555;
  margin-top: 10px;
}

.pizzaWindowArea {
  position: fixed;
  z-index: 3;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.5);
  display: none;
  transition: all ease 0.5s;
  opacity: 0;
  justify-content: center;
  align-items: center;
  overflow-y: auto;
}

.pizzaWindowBody {
  width: 900px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0px 0px 15px #999;
  display: flex;
  margin: 20px 0px;
}
.pizzaBig {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}
.pizzaBig--back {
  position: absolute;
  width: 30px;
  height: 30px;
  background-color: #000;
}
.pizzaBig img {
  height: 400px;
  width: auto;
}
.pizzaInfo {
  flex: 1;
  font-family: "Hepta Slab", Helvetica, Arial;
  padding-bottom: 50px;
}
.pizzaInfo h1 {
  margin-top: 50px;
}
.pizzaInfo .pizzaInfo--desc {
  font-size: 15px;
  color: #999;
  margin-top: 10px;
  font-family: "Lato", Helvetica, Arial;
  padding-right: 45px;
}
.pizzaInfo--sector {
  color: #ccc;
  text-transform: uppercase;
  font-size: 14px;
  margin-top: 30px;
  margin-bottom: 10px;
}
.pizzaInfo--sizes {
  display: inline-flex;
  border-radius: 10px;
  overflow: hidden;
}
.pizzaInfo--size {
  padding: 10px 15px;
  color: #000;
  background-color: #eee;
  font-size: 13px;
  font-weight: bold;
  cursor: pointer;
}
.pizzaInfo--size:hover {
  background-color: #ccc;
}
.pizzaInfo--size.selected {
  background-color: #399ade;
  color: #fff;
}
.pizzaInfo--size.selected span {
  color: #d6d6d6;
}
.pizzaInfo--size span {
  font-size: 12px;
  color: #999;
  font-weight: normal;
}
.pizzaInfo--price {
  display: flex;
  align-items: center;
}
.pizzaInfo--actualPrice {
  font-size: 28px;
  margin-right: 30px;
}
.pizzaInfo--qtarea {
  display: inline-flex;
  background-color: #eee;
  border-radius: 10px;
  height: 30px;
  overflow: hidden;
}
.pizzaInfo--qtarea button {
  border: 0;
  background-color: transparent;
  font-size: 17px;
  outline: 0;
  cursor: pointer;
  padding: 0px 10px;
  color: #333;
}
.pizzaInfo--qt {
  line-height: 30px;
  font-size: 12px;
  font-weight: bold;
  padding: 0px 5px;
  color: #000;
}
.pizzaInfo--addButton {
  margin-top: 30px;
  padding: 20px 30px;
  border-radius: 20px;
  background-color: #48d05f;
  z-index: 999;
  color: #fff;
  display: inline-block;
  cursor: pointer;
  margin-right: 30px;
}
.pizzaInfo--addButton:hover {
  background-color: #32a345;
}
.pizzaInfo--cancelButton {
  display: inline-block;
  cursor: pointer;
}
.pizzaInfo--cancelMobileButton {
  display: none;
  height: 40px;
  text-align: center;
  line-height: 40px;
  margin-bottom: 30px;
  cursor: pointer;
}
.cart {
  margin-bottom: 20px;
}
.cart--item {
  display: flex;
  align-items: center;
  margin: 10px 0;
}
.cart--item img {
  width: 40px;
  height: 40px;
  margin-right: 20px;
}
.cart--item-nome {
  flex: 1;
}
.cart--item--qtarea {
  display: inline-flex;
  background-color: #eee;
  border-radius: 10px;
  height: 30px;
}
.cart--item--qtarea button {
  border: 0;
  background-color: transparent;
  font-size: 17px;
  outline: 0;
  cursor: pointer;
  padding: 0px 10px;
  color: #333;
}
.cart--item--qt {
  line-height: 30px;
  font-size: 12px;
  font-weight: bold;
  padding: 0px 5px;
  color: #000;
}
.cart--totalitem {
  padding: 15px 0;
  border-top: 1px solid #79b9dd;
  color: #315970;
  display: flex;
  justify-content: space-between;
  font-size: 15px;
}
.cart--totalitem span:first-child {
  font-weight: bold;
}
.cart--totalitem.big {
  font-size: 20px;
  color: #000;
  font-weight: bold;
}
.cart--finalizar {
  padding: 20px 30px;
  border-radius: 20px;
  background-color: #48d05f;
  color: #fff;
  cursor: pointer;
  text-align: center;
  margin-top: 20px;
  border: 2px solid #63f77c;
  transition: all ease 0.2s;
}
.cart--finalizar:hover {
  background-color: #35af4a;
}

@media (max-width: 1000px) {
  .pizza-area {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 840px) {
  body {
    flex-direction: column;
  }
  .pizza-area {
    display: block;
  }
  .pizza-item {
    max-width: 100%;
  }
  header {
    display: flex;
  }
  h1 {
    font-size: 30px;
  }
  main {
    padding-top: 60px;
  }

  aside {
    width: auto;
    position: fixed;
    left: 100vw;
    right: 0;
    top: 0;
    bottom: 0;
    transition: all ease 0.2s;
  }
  aside.show {
    width: auto;
  }
  .cart--area {
    width: 100vw;
  }

  .menu-closer {
    display: block;
  }

  .pizzaWindowArea {
    justify-content: flex-start;
    align-items: flex-start;
  }

  .pizzaWindowBody {
    width: 100vw;
    display: block;
    padding: 20px;
    border-radius: 0;
    box-shadow: none;
    margin: 0;
  }

  .pizzaBig img {
    width: 75%;
    height: auto;
  }

  .pizzaInfo h1 {
    margin-top: 20px;
  }

  .pizzaInfo--qtarea {
    height: 60px;
  }
  .pizzaInfo--qtarea button {
    font-size: 25px;
    padding: 0px 25px;
  }
  .pizzaInfo--qt {
    line-height: 60px;
    font-size: 20px;
  }
  .pizzaInfo--addButton {
    font-size: 20px;
    display: block;
    text-align: center;
    margin: 30px auto;
  }

  .pizzaInfo--cancelButton {
    display: none;
  }
  .pizzaInfo--cancelMobileButton {
    display: block;
  }
}

/* Dark Theme */

.dark-light-toggle {
  width: 75px;
  padding: 6px 10px;
  border-radius: 20px;
  border: 2px solid #353535;
  background: #dbdbdb;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  cursor: pointer;
}

.dark-light-toggle div {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark-light-toggle div img {
  width: 20px;
  height: 20px;
}

.dark-light-toggle .selection {
  width: 26px;
  height: 26px;
  position: absolute;
  background: #353535;
  border-radius: 50%;
  transition: all 1s;
}

.selection.lightned {
  left: 4px;
}
.selection.darkned {
  right: 4px;
}

body.dark {
  background: #191919;
}

body.dark * {
  color: #fff;
}

body.dark .pizza-item--desc,
body.dark .pizza-item--price {
  color: #ccc;
}

body.dark .pizzaWindowBody {
  background: #191919;
}

body.dark .pizzaInfo--size,
body.dark .pizzaInfo--qtarea {
  background: #7e7e7e;
}
body.dark .pizzaInfo--size.pizzaInfo--size.selected {
  background: #399ade;
}

body.dark .pizzaInfo--size:hover,
body.dark .pizzaInfo--qtmais:hover,
body.dark .pizzaInfo--qtmenos:hover {
  background-color: #4e4e4e;
}

body.dark aside {
  background: #64beff;
}

body.dark .cart--item--qtarea,
body.dark .menu-openner {
  background: #00000044;
}
body.dark .cart--item--qt,
body.dark .cart--item-qtmais,
body.dark .cart--item-qtmenos {
  color: #ffffff;
}